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          <li class="sitemap-group__item sitemap-group__item--tools">
            <a
              href="/tools/"
              title="Netzwerk-Tools"
              name="topnavi.ho.sitemap.tools"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Netzwerk-Tools
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--spiele">
            <a
              href="https://spiele.heise.de"
              title="Spielen bei Heise"
              name="topnavi.ho.sitemap.spiele"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Spielen bei Heise
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--loseblattwerke">
            <a
              href="/loseblattwerke/"
              title="Loseblattwerke"
              name="topnavi.ho.sitemap.loseblattwerke"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Loseblattwerke
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--imonitor">
            <a
              href="/netze/netzwerk-tools/imonitor-internet-stoerungen/"
              title="heise iMonitor"
              name="topnavi.ho.sitemap.imonitor"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              iMonitor
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--itmarkt">
            <a
              href="/itmarkt/"
              title="IT-Markt – Branchenverzeichnis der IT-Fachhändler"
              name="topnavi.ho.sitemap.itmarkt"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              IT-Markt
            </a>
          </li>
        
      </ul>
    </div>
  </a-collapse>


  

<a-collapse
  class="sitemap-group "
  has-indicator
  media="(max-width: 929px)"
  toggle-attr-on-media="disabled"
>
    
    <div
      class="
        sitemap-group__header
        
      "
      data-collapse-trigger
    >
      Heise Medien
    </div>
    

    <div class="sitemap-group__content" data-collapse-target >
      <ul class="sitemap-group__items ">
        
          <li class="sitemap-group__item sitemap-group__item--shop">
            <a
              href="https://shop.heise.de"
              title="heise Shop – IT Fachzeitschriften, Bücher, CD/DVD/Blu-ray"
              name="topnavi.ho.sitemap.shop"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              heise Shop
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--abo">
            <a
              href="https://abo.heise.de/"
              title="Abo – c't, iX, MIT Technology Review, c't Fotografie, Mac &amp; i, Make"
              name="topnavi.ho.sitemap.abo"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Abo
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--events">
            <a
              href="/events/"
              title="heise Events – Konferenzen, Seminare, Workshops"
              name="topnavi.ho.sitemap.events"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Veranstaltungen
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--hmg">
            <a
              href="https://heise-gruppe.de/-1812545"
              title="Arbeiten bei heise – Heise als Arbeitgeber"
              name="topnavi.ho.sitemap.hmg"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Arbeiten bei Heise
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--mediadaten">
            <a
              href="/mediadaten/"
              title="Mediadaten Heise Medien"
              name="topnavi.ho.sitemap.mediadaten"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Mediadaten
            </a>
          </li>
        
          <li class="sitemap-group__item sitemap-group__item--presse">
            <a
              href="https://www.heise-gruppe.de/presse/"
              title="Presse Informationen"
              name="topnavi.ho.sitemap.presse"
              data-google-interstitial=false
              class="sitemap-group__link "
            >
              Presse
            </a>
          </li>
        
      </ul>
    </div>
  </a-collapse>

</nav>


        <div class="topnavigation__footer">
          

    

<div class="topnavigation__brandworld">
    

<span class="wrbg-note topnavigation__brandworld-label">
  Anzeige
</span>


        

<a
  href="https://www.heise.de/brandworlds/go-schule-morgen/"
  class="
    link
    topnavigation__brandworld-link
  "
  name="dachzeile.ho.nativelink"
  rel="nofollow"
  target="_blank"
>

    
      <span
      >
        Go! Schule morgen
      </span>
</a>


</div>



          



<div
  class="
    notification-links
    
  "
>
  

<a
  href="/newsletter/"
  class="
    link
    notification-links__link
  "
  name="topnavi.ho.sitemap.newsletter"
  data-google-interstitial=false
>
      


<svg
  class="link__svg"
  xmlns="http://www.w3.org/2000/svg"
  preserveAspectRatio="xMinYMin"
  viewBox="0 0 24 24">
  <path id="paper-plane-outline" d="M24,3,0,10l7.92,4.4L8,20l3.78-3.46L18,20ZM17,17.34l-5.48-3L20.85,6.4ZM20.46,5.9,9.6,13.25,4.66,10.51Z" transform="translate(0)"/>
</svg>



    
      <span
      >
        Newsletter
      </span>
</a>

    

<a
  href="/benachrichtigungen/heise-bot/"
  class="
    link
    notification-links__link
  "
  name="topnavi.ho.sitemap.heisebotti"
  data-google-interstitial=false
>
      




<svg
  id="logo-botti"
  xmlns="http://www.w3.org/2000/svg"
  class="link__svg"
  viewBox="0 0 24 24"
>
  <title>heise-Bot</title>
  <path d="M9.3,17.66c-.24.56-.62,1.21-1.32,1.21A.89.89,0,0,1,7.05,18a3,3,0,0,1,.36-1.14l3.18-7.26c.24-.55.55-.95,1.18-.95a.86.86,0,0,1,.89.89A3.36,3.36,0,0,1,12.25,11Zm2.76,1.21c.71,0,1.08-.63,1.34-1.2L14.58,15A3.74,3.74,0,0,0,15,13.59a.86.86,0,0,0-.89-.89c-.64,0-.94.43-1.19,1l-1.42,3.2A2.65,2.65,0,0,0,11.16,18,.86.86,0,0,0,12.06,18.87ZM23.64,8.3a1,1,0,0,0-1.53,1.08A9.42,9.42,0,0,1,19,10.68c-.52-4.49-4.34-7.14-8.87-7.14A10.33,10.33,0,0,0,4.4,5.22,11.49,11.49,0,0,1,2.09,1.78,1,1,0,0,0,2.51.91,1,1,0,0,0,.56,1a1,1,0,0,0,1,.91,15.71,15.71,0,0,1,1,4.84,10.36,10.36,0,0,0-2.58,7c0,5.77,4.64,9.85,10.27,9.85a10.08,10.08,0,0,0,7.47-3.53l-.42-.63a7.92,7.92,0,0,1-1,.86,10.65,10.65,0,0,1-6.16,1.94A7.51,7.51,0,0,1,2.7,14.53c0-4.82,1.92-9.13,7.37-9.13,4.07,0,7.37,2.74,7.37,7a6.65,6.65,0,0,1-1.46,4l.72.62a7.79,7.79,0,0,0,2.23-3.91,16,16,0,0,1,3.51-3.27,1,1,0,0,0,1.35-.17A1,1,0,0,0,23.64,8.3ZM10.08,21c.39.09.18-.36.48-.56s.75-.39.81-.69a1.58,1.58,0,0,1-.93.05,6.43,6.43,0,0,1-1.27-.49,2,2,0,0,0,.15,1A1,1,0,0,0,10.08,21Z" transform="translate(0 0)"/>
</svg>



    
      <span
      >
        heise-Bot
      </span>
</a>

    

<a
  href="/benachrichtigungen"
  class="
    link
    notification-links__link
  "
  name="topnavi.ho.sitemap.pushnachrichten"
  data-google-interstitial=false
>
      




<svg
  id="cp-bell-outline"
  xmlns="http://www.w3.org/2000/svg"
  class="link__svg"
  viewBox="0 0 24 24"
>
  <title>Push Nachrichten</title>
  <path d="M15,20.9c0,1.6-1.3,2.9-3,3c-1.6-0.1-2.9-1.4-3-3h1.7c0,0,0,0,0,0.1c0,0.7,0.6,1.3,1.3,1.3 c0.7,0,1.3-0.6,1.3-1.3c0,0,0,0,0-0.1H15z M21.9,17.2v1.7H2.1v-1.7C6.9,15.6,4.2,6.7,8.9,4c0.6-0.4,1-1.1,1-1.8l0,0 c0-1,0.7-2,1.7-2.2C11.9,0,12.1,0,12.4,0c1,0.2,1.7,1.1,1.7,2.1l0,0c0,0.7,0.4,1.4,1,1.8C19.7,6.7,17.1,15.6,21.9,17.2z M19.2,16.9 c-4-2-1.4-9.6-5.8-12.2c-0.1-0.1-0.2-0.1-0.4-0.2c-0.3-0.2-0.6-0.3-1-0.3c-0.3,0-0.6,0.1-0.9,0.2c-0.2,0.1-0.3,0.1-0.5,0.2 C6.1,7.4,8.8,14.9,4.8,16.9H19.2z"/>
</svg>



    
      <span class="a-u-hide-from-tablet">
        Push
      </span>
      <span class="a-u-show-from-tablet">
        Push-Nachrichten
      </span>
    
</a>


</div>


        </div>
      </div>

    </header>
    
</div>

    <template id="upscore-reco-template-free">
  














  
<article
  class="
    a-article-teaser
    a-article-teaser--mobile-in-list
    a-theme
    
  "
    data-upscore-object-id="${object_id}"
  data-cid="${object_id}"
>

    <a
      href="${url}"
      title="${title}"
      class="
        a-article-teaser__link
      "
        data-upscore-url
      
    >

    

    
  

<figure
  class=" a-article-teaser__image-container"
>

  <div
  >
      



<a-img
  width="16"
  height="9"
  layout="responsive"
  src="${image}"
  alt="${title}"
  quality="85"
  high-dpi-quality="50"
  
  style="aspect-ratio: 16 / 9;"
>
  <img
    src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='696px' height='391px' viewBox='0 0 696 391'%3E%3Crect x='0' y='0' width='696' height='391' fill='%23f2f2f2'%3E%3C/rect%3E%3C/svg%3E"
    width="16"
    height="9"
    alt="${title}"
    style="aspect-ratio: 16 / 9; object-fit: cover;"
  >
</a-img>

<noscript>
  



<img
  src="https://heise.cloudimg.io/width/16/q50.png-lossy-50.webp-lossy-50.foil1/_www-heise-de_/$%7Bimage%7D"
  srcset="
    https://heise.cloudimg.io/width/336/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 336w,
    https://heise.cloudimg.io/width/1008/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 1008w,
    https://heise.cloudimg.io/width/32/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 2x
  "
  alt="${title}"
  width="16"
  height="9"
  class="legacy-img "
  loading="lazy"
  decoding="async"
>

</noscript>


  </div>

</figure>




  <div
    class="
      a-article-teaser__content-container
      
    "
  >
    <header>
      <h1
        class="
          a-article-teaser__title
            
        "
      >
          <span class="
              a-article-teaser__kicker
              
            "
          >
            ${intro}
          </span>

        <span class="a-article-teaser__title-text" data-upscore-title>
          ${title}
        </span>
      </h1>
    </header>

    
    <p class="
      a-article-teaser__synopsis
      
      "
      >${lead}    </p>

    

    


  </div>

  </a>

      



  

</article>





</template>

<template id="upscore-reco-template-premium">
  














  
<article
  class="
    a-article-teaser
    a-article-teaser--mobile-in-list
    a-theme
    
  "
    data-upscore-object-id="${object_id}"
  data-cid="${object_id}"
>

    <a
      href="${url}"
      title="${title}"
      class="
        a-article-teaser__link
      "
        data-upscore-url
      
        data-google-interstitial=false
    >

    

    
  

<figure
  class=" a-article-teaser__image-container"
>

  <div
  >
      



<a-img
  width="16"
  height="9"
  layout="responsive"
  src="${image}"
  alt="${title}"
  quality="85"
  high-dpi-quality="50"
  
  style="aspect-ratio: 16 / 9;"
>
  <img
    src="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='696px' height='391px' viewBox='0 0 696 391'%3E%3Crect x='0' y='0' width='696' height='391' fill='%23f2f2f2'%3E%3C/rect%3E%3C/svg%3E"
    width="16"
    height="9"
    alt="${title}"
    style="aspect-ratio: 16 / 9; object-fit: cover;"
  >
</a-img>

<noscript>
  



<img
  src="https://heise.cloudimg.io/width/16/q50.png-lossy-50.webp-lossy-50.foil1/_www-heise-de_/$%7Bimage%7D"
  srcset="
    https://heise.cloudimg.io/width/336/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 336w,
    https://heise.cloudimg.io/width/1008/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 1008w,
    https://heise.cloudimg.io/width/32/q30.png-lossy-30.webp-lossy-30.foil1/_www-heise-de_/$%7Bimage%7D 2x
  "
  alt="${title}"
  width="16"
  height="9"
  class="legacy-img "
  loading="lazy"
  decoding="async"
>

</noscript>


  </div>

</figure>




  <div
    class="
      a-article-teaser__content-container
      
    "
  >
    <header>
      <h1
        class="
          a-article-teaser__title
            
        "
      >
          <span class="
              a-article-teaser__kicker
              
            "
          >
            ${intro}
          </span>

        <span class="a-article-teaser__title-text" data-upscore-title>
          ${title}
        </span>
      </h1>
    </header>

    
    <p class="
      a-article-teaser__synopsis
      
      "
      >${lead}    </p>

    

    
  <footer
    class="
      a-article-meta
      
      a-article-teaser__meta
    "
  >
      <svg class="a-article-meta__heiseplus-logo" viewBox="0 0 192 60">
        <use href="/icons/common-icons.svg#heiseplus-logo-small"></use>
      </svg>
    







    

  </footer>


  </div>

  </a>

      



  

</article>





</template>

<template id="upscore-reco-template-wrapper-homepage">
  <div class="teaser-grid teaser-grid--3 top-stage__row">${content}</div>
</template>


<template id="upscore-reco-template-wrapper-article-premium">
  <aside class="stage stage--channel a-u-grid-pullout-mobile a-u-grid-pushin-mobile" aria-role="complementary">
    <header
      class="a-container-header stage__header stage__header--no-mobile-padding a-container-header--bordered a-container-header--one-row">
      <a href="/plus/" class="a-container-header__link">
        <h2 class="
            a-container-header__heading
            a-container-header__heading--small
          ">
          <span class="
              a-container-header__logo
              a-container-header__logo--heiseplus
              a-container-header__logo--margin
            ">
            heise+
          </span>
          <span class="a-container-header__slug">
            Das Beste aus heise+
          </span>
        </h2>
        <nav class="a-container-header__more">
          <span class="
              a-container-header__more-text
              a-u-show-from-tablet
            ">
            Zur heise+ Startseite
          </span>
          <span class="a-container-header__more-icon"></span>
        </nav>
      </a>
    </header>
    <div class="
        teaser-grid
        teaser-grid--h-gutter
        teaser-grid--4
        channel_ho
      ">
      ${content}
    </div>
  </aside>
</template>


<template id="upscore-reco-template-wrapper-article">
  <aside class="stage stage--channel a-u-grid-pullout-mobile a-u-grid-pushin-mobile" aria-role="complementary">
    <header
      class="a-container-header stage__header stage__header--no-mobile-padding a-container-header--bordered a-container-header--one-row">
      <a href="/" class="a-container-header__link">
        <h2 class="
            a-container-header__heading
            a-container-header__heading--small
          ">
          <span class="
              a-container-header__logo
              a-container-header__logo--ho
              a-container-header__logo--margin
            ">
            heise online
          </span>
          <span class="a-container-header__slug">
            Top-Beiträge von heise online
          </span>
        </h2>
        <nav class="a-container-header__more">
          <span class="
              a-container-header__more-text
              a-u-show-from-tablet
            ">
            Zur heise online Startseite
          </span>
          <span class="a-container-header__more-icon"></span>
        </nav>
      </a>
    </header>
    <div class="
        teaser-grid
        teaser-grid--h-gutter
        teaser-grid--4
        channel_ho
      ">
      ${content}
    </div>
  </aside>
</template>


    

      <div class="a-layout a-layout--transparent a-u-no-margin-bottom">
        <div
          class=" a-layout__container a-layout__container--full-width"
        >
          <div class="a-layout__item a-layout__item--full-width">
            <div class="ldb-container">
              <script>performance.mark('FRAME-Ads Anfang');</script>
              <div class="perf-cls-reduc-leaderboard">
                  





  <a-ad
    width="970"
    height="90"
    layout="fixed"
    
    instant
    
    
    
    
    class="a-ad a-ad--leaderboard"
    sizes="728x90,800x250,960x250,970x250,1104x90,1104x250"
    targeting="{&quot;cms&quot;:&quot;1929769&quot;,&quot;kw&quot;:[&quot;Backdoor&quot;,&quot;Linux und Open Source&quot;,&quot;OpenX&quot;,&quot;Sicherheitslücke&quot;,&quot;Trojaner&quot;,&quot;c't Security&quot;],&quot;pos&quot;:[&quot;top&quot;,&quot;sonderformat&quot;],&quot;themenhub&quot;:&quot;yes&quot;}"
    unit="/6514/www.heise.de/security/sec-news"
    type="gpt"
    preload-distance="200"
    
    media="(min-width: 1240px)"
    
  ></a-ad>






  <a-ad
    width="728"
    height="90"
    layout="fixed"
    
    instant
    
    
    
    
    class="a-ad a-ad--leaderboard"
    sizes="728x90"
    targeting="{&quot;cms&quot;:&quot;1929769&quot;,&quot;kw&quot;:[&quot;Backdoor&quot;,&quot;Linux und Open Source&quot;,&quot;OpenX&quot;,&quot;Sicherheitslücke&quot;,&quot;Trojaner&quot;,&quot;c't Security&quot;],&quot;pos&quot;:[&quot;top&quot;,&quot;sonderformat&quot;],&quot;themenhub&quot;:&quot;yes&quot;}"
    unit="/6514/www.heise.de/security/sec-news"
    type="gpt"
    preload-distance="200"
    
    media="(min-width: 768px) and (max-width: 1239px)"
    
  ></a-ad>


                





  <a-ad
    width="728"
    
    layout="fixed"
    acceptable
    instant
    
    
    
    
    class="a-ad a-ad--leaderboard"
    sizes="728x90"
    targeting="{&quot;cms&quot;:&quot;1929769&quot;,&quot;kw&quot;:[&quot;Backdoor&quot;,&quot;Linux und Open Source&quot;,&quot;OpenX&quot;,&quot;Sicherheitslücke&quot;,&quot;Trojaner&quot;,&quot;c't Security&quot;],&quot;pos&quot;:[&quot;top&quot;],&quot;themenhub&quot;:&quot;yes&quot;}"
    unit="/6514/www.heise.de/security/sec-news"
    type="gpt"
    preload-distance="200"
    
    media="(min-width: 768px)"
    
  ></a-ad>


              </div>
                





  <a-ad
    width="200"
    height="800"
    layout="fixed"
    
    instant
    
    
    
    
    class="a-ad a-ad--skyscraper"
    sizes="120x600,120x800,160x600,160x800,200x600,200x800"
    targeting="{&quot;cms&quot;:&quot;1929769&quot;,&quot;kw&quot;:[&quot;Backdoor&quot;,&quot;Linux und Open Source&quot;,&quot;OpenX&quot;,&quot;Sicherheitslücke&quot;,&quot;Trojaner&quot;,&quot;c't Security&quot;],&quot;pos&quot;:[&quot;top&quot;,&quot;sonderformat&quot;],&quot;themenhub&quot;:&quot;yes&quot;}"
    unit="/6514/www.heise.de/security/sec-news"
    type="gpt"
    preload-distance="200"
    
    media="(min-width: 1310px)"
    
  ></a-ad>


              <script>
                performance.mark('FRAME-Ads Ende');
                performance.measure('FRAME-Ads', 'FRAME-Ads Anfang', 'FRAME-Ads Ende');
              </script>
            </div>
          </div>
        </div>
      </div>

      <div class="a-layout a-u-mb-4" id="bottom-up">

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      <p>Die aktuelle Version der Anzeigen-Server-Software OpenX enthält eine Hintertür, über die ein Angreifer beliebigen PHP-Code in den Server einschleusen und ausführen kann. Der bisher unbekannte Hintertür-Code findet sich im Download-Paket der aktuellen Version OpenX 2.10 und wird akut für Angriffe genutzt.</p>

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<p><a href="http://www.openx.com/" rel="external noopener" target="_blank">OpenX</a> ist eine Open-Source-Software zur Auslieferung von Werbemitteln. Bei einer &quot;Routine-Kontrolle&quot; eines Anzeigen-Servers entdeckte heise-Security-Leser Heiko Weber merkwürdige Logfile-Einträge, deren Analyse zur Entdeckung einer Hintertür im OpenX-Quellcode führte. Er informierte heise Security; wir konnten seine Beobachtungen nachvollziehen und meldeten den Sachverhalt am Montagmorgen dem Security-Kontakt des OpenX-Teams. Bislang erfolgte jedoch keine Reaktion. Das von heise Security ebenfalls informierte <a href="https://www.cert-bund.de/" rel="external noopener" target="_blank">CERT-Bund</a> erklärte, dass man das Vorhandensein der Backdoor bestätigen kann.</p>
<p>Die Backdoor findet sich in den Download-Archiven des Servers von OpenX – und zwar sowohl in openx-2.8.10.zip als auch in der tgz- und der bz2-Version. Es ist bisher weder bekannt, welche Versionen darüber hinaus betroffen sein könnten, noch wie der Code dorthin gekommen ist. Allerdings findet sich die Hintertür bereits in einem Download aus November 2012; sie dürfte also mindestens ein dreiviertel Jahr unbemerkt online gewesen sein.</p>
<p>Wer selbst einen OpenX-Server administriert, kann den Backdoor-Code mit folgendem Befehl aufspüren:</p>
<pre class="rte__tx--listing">find . -name \*.js -exec grep -l &#39;&lt;?php&#39; {} \;</pre>
<p>Wenn das einen Dateinamen meldet, handelt es sich um eine JavaScipt-Datei, die mit eingestreuten Kommentaren obfuszierten PHP-Code enthält:</p>
<pre class="rte__tx--listing">this.each(function(){l=flashembed(this,k,j)}<span class="tx_red rte__tx--red">&lt;?php </span><span class="tx_blue rte__tx--blue">/*if(e)<br>{jQuery.tools=jQuery.tools||{version:<br>{}};jQuery.tools.version.flashembed=&#39;1.0.2&#39;; <br>*/</span><span class="tx_red rte__tx--red">$j=&#39;ex&#39;.</span><span class="tx_blue rte__tx--blue">/**/</span><span class="tx_red rte__tx--red">&#39;plode&#39;; </span><span class="tx_blue rte__tx--blue">/* if(this.className ...</span></pre>
<p>Die Datei wird durch einen Aufruf von <code>require_once()</code> aktiviert, der sich mit der richtigen URL von außen triggern lässt; sie ist in einem ZIP-Archiv enthalten, die das Datum 12.9.2012 trägt:</p>






  


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<pre class="rte__tx--listing">openx-2.8.10/etc/plugins/openXVideoAds.zip <br>     md5: 6b3459f16238aa717f379565650cb0cf  </pre>
<p>Das Paket wird bei einer normalen Installation anscheinend ausgepackt. Auf dem analysierten Server nutzten die Einbrecher die Hintertür, um eine PHP-Shell in <code>/www/images/debugs.php</code> abzulegen, über die sie dann vollen Zugriff auf den Server hatten. Deren Einträge in der Log-Datei führten letztlich zur Entdeckung.</p>
<p>Wer einen betroffenen Server verwaltet, sollte diesen sofort außer Betrieb nehmen und eine detaillierte Analyse der Log-Dateien vornehmen. Sobald das OpenX-Team reagiert, werden wir weitere Informationen veröffentlichen.</p>
<p>Bereits vor einigen Monaten hatte das <a href="/meldung/BSI-warnt-vor-erneuten-Angriffen-ueber-Anzeigen-1836278.html" rel="external noopener" target="_blank">BSI vor massiven Angriffen gewarnt</a>, bei denen Unbekannte versuchten, die Besucher von Web-Seiten über Anzeigen mit Trojanern zu infizieren. Viele der beobachteten Server, die die bösartigen Werbemittel auslieferten, liefen mit OpenX. Eine Hintertür in der aktuellen Version lässt dies in einem neuen Licht erscheinen.</p>
<p><strong>Update 7:50 6.8.2013</strong>: Das OpenX-Security-Team hat bestätigt, dass es die betroffenen Dateien vom Server entfernt hat und an einem offiziellen Advisory arbeite.

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